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If you align your findersope to make finding things easier AND collimate your scope you should be able to see the major cloud bands using your 10mm eyepiece on a clear and steady night. As Mike said you will need to collimate, allow your scope to cool to ambient (leave it outside for an hour before using it) and practice observing which means looking at the object for more than a few seconds. The seeing can vary greatly and you will see details coming and going on many nights, its only on those really rare nights that you will see a steady view. As for upping your power, I would advise against it, I mainly use my 9.7mm lense for planets and only go higher if the seeing can support it and with this lense I can see quite a lot of detail on Jupiter. Before buying any more lenses it would be worth you getting a cheshire eyepiece and a laser collimator to allow accurate collimation to get the most out of your present gear.
Most important of all is to hug your dob a lot and get to know it and practice observing.
Cheers
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